scholarly journals Ship electromotive system with common DC buses

2019 ◽  
Vol 135 ◽  
pp. 02009
Author(s):  
Fedor Gelver ◽  
Veniamin Samoseiko ◽  
Alexandr Saushev
Keyword(s):  
Electric Propulsion ◽  
Analytical Description ◽  
Electric Power System ◽  
Working Environment ◽  
Propulsion Systems ◽  
Voltage Level ◽  
Electric Generator ◽  
Operational Energy ◽  
Universal Structure ◽  
Electric Plant

The universal structure of the ship’s electromotive system with common DC (direct current) buses is proposed. It is shown that this structure allows: improving operational, energy, environmental and massdimensional characteristics of the motive system; increasing the reliability and survivability of the ship’s electric power system; braking propellers with the transfer of braking energy to consumers of its own needs or to the energy storage; redistributing energy between propulsion electric machines with the dissipation of braking energy in the working environment; providing fuel economy in the range of 12^15 % depending on the modes of operation of the ship in comparison with the known structures of electric propulsion systems. Analytical dependences that allow choosing the voltage level of the electric generator and coordinating it with the level of nominal voltages on the propeller motors and other load connected to the voltage inverters are obtained. A function for the analytical description of the limiting reversible mechanical characteristic of the propeller is synthesized. The mathematical description of the braking and reverse modes of the propulsion electric plant is given. Synthesis of algorithms of control of propulsion electric plant with two propellers at braking and reverse is carried out. The time diagrams of the torque, speed and power changes at each of the propellers for the proposed algorithm of braking and reverse of the propeller motors are presented.

scholarly journals Способы компенсации высших гармоник напряжения в судовых электроэнергетических системах

2020 ◽  
Author(s):  
A.S. Kornev ◽  
V.I. Kuznetsov ◽  
H. Pan ◽  
A.P. Senkov
Keyword(s):  
Electric Power ◽  
Electric Propulsion ◽  
Frequency Converter ◽  
Electric Power System ◽  
Propulsion Systems ◽  
Higher Harmonics ◽  
Frequency Converters ◽  
Three Phase ◽  
Harmonic Components ◽  
Waveform Distortions

В статье выполнен анализ способов компенсации высших гармоник в судовой сети единой электроэнергетической системы (ЕЭЭС), в составе которой, основным потребителей электроэнергии является система электродвижения (СЭД). Рассмотрены три схемы компенсации высших гармоник, создаваемых неуправляемыми выпрямителями, входящими в состав преобразователей частоты (ПЧ). Проведено компьютерное моделирование фрагмента структуры ЕЭЭС, запатентованной фирмой Siemens , схемы 18-пульсного выпрямителя, а также схемы с двумя 12-пульсными выпрямителями. Результаты моделирования показали, что в структуре ЕЭЭС фирмы Siemens , пропульсивный трансформатор обеспечивает компенсацию только части высших гармоник, из-за чего, искажения формы напряжения в судовой сети могут быть значительными. Схема, содержащая два 12-пульсных выпрямителя, а также трехфазный трансформатор с четырьмя трехфазными обмотками, имеющими сдвиг фаз на 15 электрических градусов, показала наилучшие показатели по качеству тока, обеспечивая эффективную компенсацию 5, 7, 11, 13 гармонических составляющих тока. Предложенная схема с двумя 12-пульсными выпрямителями позволяет в составе ПЧ применить трехуровневые автономные инверторы напряжения, характеризующиеся высоким качеством тока в обмотках гребного электродвигателя.The article analyzes the methods for compensating for higher harmonics in the ship network of the unified electric power system (UEPS), in which the main electric power consumers are electric propulsion systems (EPS). Three compensation schemes for higher harmonics created by uncontrolled rectifiers that are part of frequency converters are considered. Computer simulation of a fragment of the UEPS structure patented by Siemens, an 18-pulse rectifier circuit, and also circuits with two 12-pulse rectifiers were carried out. The simulation results showed that in the Siemens UEPS structure, a propulsive transformer provides compensation for only a part of the higher harmonics, due to which, voltage waveform distortions in the ship network can be significant. The circuit, containing two 12-pulse rectifiers, as well as a three-phase transformer with four three-phase windings having a phase shift of 15 electrical degrees, showed the best current quality indicators, providing effective compensation for 5, 7, 11, 13 harmonic components of the current. The proposed circuit with two 12-pulse rectifiers allows the use of three-level autonomous voltage inverters, which are characterized by high quality current in the windings of the propeller motor, as part of the frequency converter.

Electromagnetic emission experiences using electric propulsion systems

1989 ◽  
Vol 5 (5) ◽  
pp. 534-547 ◽  
Author(s):  
James S. Sovey ◽  
Lynnette M. Carney ◽  
Steven C. Knowles
Keyword(s):  
Electric Propulsion ◽  
Electromagnetic Emission ◽  
Propulsion Systems

Research on Parameters Matching of Ultralight Electric Aircraft Propulsion System

2013 ◽  
Vol 732-733 ◽  
pp. 1212-1215
Author(s):  
Gui Wen Kang ◽  
Yu Hu ◽  
Ya Dong Li ◽  
Wen Hui Jiang
Keyword(s):  
Electric Propulsion ◽  
High Energy ◽  
Low Noise ◽  
Electric Power System ◽  
Propulsion System ◽  
Heat Radiation ◽  
Design Parameters ◽  
Electric Propulsion System ◽  
Electric Aircraft ◽  
Parameter Matching

The propulsion system of ultralight electric aircraft is one of the general aviation technology development directions. It has the advantages such as light pollution, low noise, high energy utilization ratio, simple structure, easy maintenance, high reliability, less heat radiation, little operation cost and so on. Combined with the certain type of ultralight aircraft design parameters, the layout of aircraft electric propulsion, the principles and steps of the parameter matching of electric propulsion system were presented. The method of parameter matching and performance verification of electric propulsion system was put forward. The feasibility of the system is verified from the point of dynamic property. The study of parameter matching of electric propulsion system could not only provide basis for the integrated optimization for electric power system, but also evaluate the performance of the system simulation as reference.

Study on Direct Torque Control Applied in the Electrical Propulsion Ship

2011 ◽  
Vol 354-355 ◽  
pp. 1252-1256
Author(s):  
You Tao Zhao ◽  
Yan Cheng Liu ◽  
Jun Jie Ren
Keyword(s):  
Electric Propulsion ◽  
Control Method ◽  
Direct Torque Control ◽  
Torque Control ◽  
Regulation System ◽  
Propulsion Systems ◽  
Speed Regulation ◽  
Imple Mentation ◽  
Electrical Propulsion ◽  
Simulation Results

With the development of AC (alternating current )technique, larger power PMSM ( permanent m- agnet synchronous motor ) has been applied in the marine electric propulsion systems. In this paper the imple- mentation of the DTC (direct torque control) systems for a variable-speed 4088kW PMSM in ship electric propulsion systems has been studied. A novel control method using SVPWM (space vector pulse width mo- dulation) was proposed and a SVPWM module was designed. Then a DTC – SVPWM simulation model of PMSM with the load of propeller was found. The simulation results shows that the variable frequency speed regulation system have good response performance in the process of the motor start or speedup and through comparing the simulation results with the experiment data of the PMSM, the validity of the model is verified.

Conceptual design of electric propulsion systems for ultralight manned airplane

2020 ◽  
pp. 5-14
Author(s):  
A.V. Varyukhin ◽  
V.S. Zakharchenko ◽  
A.V. Geliev ◽  
M.V. Gordin ◽  
I.O. Kiselev ◽  
...  
Keyword(s):  
Conceptual Design ◽  
Electric Propulsion ◽  
Propulsion Systems
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